package com.qihang.hello.netty.wechat;

import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.util.concurrent.GlobalEventExecutor;

public class MyChatServerHandler extends SimpleChannelInboundHandler<String> {
    private static ChannelGroup channelGroup = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {

        Channel channel = ctx.channel();

        channelGroup.forEach(ch -> {
            if (channel != ch) {
                ch.writeAndFlush(channel.remoteAddress() + ":" + msg);
            }
            else {
                ch.writeAndFlush("【自己】- " + msg);
            }

        });

    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.close();
    }



    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();

        channelGroup.writeAndFlush("【服务器】 - " + channel.remoteAddress() + "加入\n");
        channelGroup.add(channel);

    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();

        channelGroup.writeAndFlush("【服务器】- "+ channel.remoteAddress()+"离开\n");

        //netty 会自动清除断开的Channel
//        channelGroup.remove(channel);
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        System.out.println(
                ctx.channel().remoteAddress() + "上线\n"
        );

    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        System.out.println(
                ctx.channel().remoteAddress() + "下线\n"
        );
    }
}
